Fishy/ˈfɪʃi/ Definition 1 of 2Pro Tip 1/3Trust Your Gut Use 'fishy' when you have an intuition that something isn't right, often without clear evidence. He offered to fix my car for free, which felt fishy. Pro Tip 2/3Informal Suspicion 'Fishy' is often used in casual conversation rather than formal situations. When she paid in all cash, the deal started to seem fishy. Pro Tip 3/3Detective Work Think of 'fishy' to describe scenarios like those in mystery novels, where motives are questionable. The alibi he gave the police was fishy.